Escape newline chars in conditionalPanel expr. Fixes rstudio#1818

Author: wch

NEWS.md

@@ -11,6 +11,8 @@ shiny 1.0.4.9000
 
 ### Bug fixes
 
+* Fixed [#1818](https://github.com/rstudio/shiny/issues/1818): `conditionalPanel()` expressions that have a newline character in them caused the application to not work. ([#1820](https://github.com/rstudio/shiny/pull/1820))
+
 ### Library updates
 
 

srcjs/utils.js

@@ -161,7 +161,11 @@ function pixelRatio() {
 // "with" on the argument value, and return the result.
 function scopeExprToFunc(expr) {
   /*jshint evil: true */
-  var expr_escaped = expr.replace(/[\\"']/g, '\\$&').replace(/\u0000/g, '\\0');
+  var expr_escaped = expr
+    .replace(/[\\"']/g, '\\$&')
+    .replace(/\u0000/g, '\\0')
+    .replace(/\n/g, '\\n');
+
   try {
     var func = new Function(
       `with (this) {